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Schneider Electric Modicon M340 DoS Vulnerability

Information

Severity

Severity

High

Family

Family

Denial of Service

CVSSv2 Base

CVSSv2 Base

7.8

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Solution Type

Solution Type

Vendor Patch

Created

Created

5 years ago

Modified

Modified

4 years ago

Summary

Schneider Electric Modicon M340 devices are prone to a denial of service vulnerability.

Insight

Insight

During communication between the operator and PLC using function code 0x5A of Modbus, it is possible to send a specially crafted set of packets to the PLC and cause it to freeze, requiring the operator to physically press the reset button of the PLC in order to recover.

Affected Software

Affected Software

Schneider Electric BMXNOC0401, BMXNOE0100, BMXNOE0110, BMXNOE0110H, BMXNOR0200H, BMXP341000, BMXP342000, BMXP3420102, BMXP3420102CL, BMXP342020, BMXP342020H, BMXP342030, BMXP3420302, BMXP3420302H and BMXP342030H prior to firmware version 2.9.

Detection Method

Detection Method

Checks if a vulnerable version is present on the target host.

Solution

Solution

Upgrade to firmware version 2.9 or later.

Common Vulnerabilities and Exposures (CVE)